Speaking-tube whistle



(No Model.)

J. P. WOLLENSAK.

SPEAKING TUBE WHISTLE.

No. 427,720. Patented May 13, 1890.

.0752? I WZZenJaZ UNITED STATES PATENT OFFICE.

JOHN F. VOLLENSAK, OF CHICAGO, ILLINOIS.

SPEAKING-TUBE WHISTLE.

SPECIFICATION forming part of Letters Patent No. 427,720, dated May 13,1890.

Application filed December 80, 1889. Serial No. 835,414. (No model.)

To all whom, it 71mg concern.-

Be it known that 1, JOHN F. \VOLLENSAK, a citizen of the United States,residing at Ohicago, Illinois, have invented certain new andusefulImprovements'in Speaking-Tube Whistles, of which the following isa specification.

The object of my invention is to provide means to hold the piececontaining the whistle in its proper central position, and prevent itsbeing moved to one side or the other and my invention consists in thefeatures and details of construction hereinafter described and claimed.

In the drawing, Figure l is a vertical section of a speaking-tubewhistle, showing the whistle-piece turned back to open the tube, andFig. 2 is a plan view of a section taken in the line 2 of Fig. 1,looking in the direction of the arrow and showing the whistle-piece downin its central or normal position.

Heretofore the whistle-piece in speakingtubes has been fastened to a rodextending through the tube and provided at the outer end with a smallcrank to enable a person to turn the whistle-piece back to open the endof the tube. This crank-rod has been provided with a spring whosetendency is to hold the whistle-piece in that position which closes theend of the tube. This spring by itself has not been able,however, toprevent lateral displacement of the whistle-piece and to hold it in atrue central position, and it has therefore been liable to be movedtoward one side or the other, as the crank-rod to which it is fastenedis pulled or pushed in the one direction or the other. This movement toone side makes an opening at the side of the whistle-piece, throughwhich the air can escape and fail to operate the whistle. This defeethas been a matter of annoyance and trouble in the practical operation ofspeaking-tube provided with whistles. In myimprovement I overcome thisobjection and positively secure the whistlc-piece in its normal centralposition, so that it will always cause the whistle to sound.

In making my improvement I take the ordinary shell or caseA,whistle-piece l5, rod 0, and spring D, arranged in the usual way. Iarrange a piece or connection E between the crank-rod and whistle-piece,provided with shoulders c, and solder the same to the rod and thewhistle-piece. The shoulders c extend out far enough on either side tocome into contact with the shell or case in which the whistle-piece isarranged. By thus contacting with the shell or case they prevent the rodfrom being moved or slid in the one direction or the other, and sooperate to constantly hold it in its normal central position. Thispositive holding of the whistle-piece always insures the properoperation of the whistle when the tube is blown into, and evercomes thedefect of lateral displacement, which, in the absence of means to holdthe whistlepiecein its central position, often rendered the whistleinoperative and useless.

hat I regard as new, and desire to secure by Letters Patent, is-

In a speaking-tube, the combination of a shell or case, a whistle-piecearranged therein, a crank-rod for turning the whistlepiece, and aconnection between the crank-rod and the whistle-piece, provided withshoulders abutting against the sides of the shell or case and holdingthe whistle-piece in its true central position against lateraldisplacement, substantially as described.

J OIIN F. WOLLENSAK. \Vitncsses:

Tnonns A. BANNING, 5A MUEL IIIBREN.

